Hello good people of Fedora!
Most of you is probably facing very slow java (java-1.8.0-openjdk) on any arm32
device.
The luckier from you already tuned arm32 boards to not need java at all.
But behold! The "new"[0] OpenJDK for arm32 crossed milestone when it can be
widely used.
If you need java on your arm32 board, try to replace (or install alongside) your java-1.8.0-openjdk
special package java-1.8.0-openjdk-aarch32
The theoretical speedup[1] is aprox 100x faster. Practical speedup is somewhere between 10x-50x (for
now). You can see it in koji:
http://koji.fedoraproject.org/koji/buildinfo?buildID=780150 - java build by "normal" java on aarch32
- 13 hours
http://koji.fedoraproject.org/koji/buildinfo?buildID=802986 - java build by "new" java on aarch32 -
2 hours
We have already slowly started to enable virtual java provides:
f24 - no
f25 - java
f26 - java+java-devel
Please *don't* change your specfiles (if any) to something like:
ifarch arm32
BuildRequires java-1.8.0-openjdk-aarch32-devel
else
BuildRequires java-1.8.0-openjdk-devel
fi
You will mess up things a lot. The provides will come with stability and in longer run the package
will be merged back to java-1.8.0-openjdk packages (as it is still the same friendly openjdk, just
with different virtual machine)
hth
J.
[0] http://koji.fedoraproject.org/koji/packageinfo?packageID=22627
[1]
http://mail.openjdk.java.net/pipermail/aarch32-port-dev/2016-September/000440.html
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